For Monday

1
For Monday

• Read 10.1-10.2
• WebCT quiz 18

2
Program 6

• Any questions?

3
File Practice

• Write code to read a file of integers and write a
  new file with one integer per line of the new
  file.

4
File Practice

• The files input1.txt and input2.txt each contain
  a list of numbers of type int in ascending order.
  Write a program to create a new file,
  output.txt, that contains all of the numbers from
  both input files in sorted order. Use a function
  that will accept as parameters any two open input
  streams and an open output stream.

5
Objects and Records

• Approaches to reading objects
• Approaches to writing objects
• Issues to deal with
• New lines
• Multiple word fields

6
The File Class

• Contains a number of methods
• Useful for answering questions about files

7
Interacting with the User

• How is this similar to files?
• How is it different?

8
System.in
9
Practice Problem

• Write Java code to ask for a students exam score
  out of 100. Your program is then to match the
  exam score to a letter grade and print the grade
  to the screen. The letter grade is to be
  calculated as follows 90 and above A 80-89 B
  70-79 C 60-69 D below 60 F

10
Switch Practice

• A program is required to read a customers name,
  a purchase amount and a tax code. The tax has
  been validated and will be one of the
  following 0 tax exempt (0) 1 state sales tax
  only (3) 2 federal and state sales tax
  (5) 3 special sales tax (7)The program must
  then compute the sales tax and the total amount
  due and print the customers name, purchase
  amount, sales tax and total amount due.

11
Practice

• Design and write a program that will prompt for,
  receive, and total a collection of payroll
  amounts entered by the user until a sentinel
  amount of -99 is entered. After the sentinel has
  been entered, display the total payroll amount on
  the screen.

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Problem 3

• Write a program that sums a sequence of integers.
  Assume that the first integer read specifies the
  number of values remaining to be entered. Your
  program should read only one value at a time. A
  typical input sequence might be 5 100 200 300
  400 500

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Problem 4

• Write a program that finds the smallest of
  several integers. Assume that input will end
  when a sentinel value of 999 is read. Do not
  count 999 as one of the integers to consider.

14
JFileChooser